Piston rod



H. V. HAlGHT May 6, 1930.

PIsToN ROD Filed Feb. 17. 1927 INVENTOR. IZH Z H/s ATTNEYS.

von a Patented MayV 6, 1930l UNI-ren 'STATES' HARRY v. BRIGHT., orSHERBROOKE, QUECBEdNcANADa.AssrGNoR To fiNeERsoELf RAND COMPANY, YorJERSEY CITY, NEW. JERSEY, AcoRroRnrroN or NEW .rERsEY rIsToN" RonApplication led February 17', 152'?. Serial 'Noi'16,040.

This invention relates to piston rods, but more particularly to pistonrods adapted to move in a horizontal plane, as in horizontalcompressors, engines and the like.

One object of the invention is to prevent deflection of the piston roddue to the weight of the piston which it supports, thus enabling thepiston to be held substantially concentric` With'respect to thecylinder.

Other objects will appear hereinafter. n The invention consists of thecombination of elements, features of construction, and ar.

rangement of parts substantially as hereinafter described and claimedand illustrated in the accompanying drawings, in which.-

Figure lis a longitudinal sectional elevation of a compressor having theAinvention applied thereto, and f Figure 2 is a transverse view takenthrough Figure 1 on line 2.2 looking inthe direction l indicated by thearrows.

Referring to the drawings, the invention is shownembodied in acompressor designed generally by A. The compressor A is of thehorizontal double acting type and has a cylinder B to the ends of whichare secured heads C andD by meansof bolts E. vThe usual inlet andexhaust valves have in this instance been omitted from the drawings forthe sakey of simplicity of illustration. l

Formed integrally with the heads C and D are bearing portions F and Grespectively for a piston rod H. The piston rod H in the presentinstance is of the hollow ortubular form and is externally threaded asat J Vto is a hub portion Q, which forms aseat fora hollow piston R4reciprocableV in the cylinderV B. The end walls S ofthe piston Rpreferably converge so that the faceT ofthe piston will be relativelynarrow to reduce contact between the piston andthe cylinder to the ewidth desired. The face T of the piston'R rings U.

by means of ardis- As is well known, a problem-which` requires al greatdeal of. consideration in `.structures of this type -isthatof suitablysupporting v,the piston in 'Vthevcylinder to prevent the weight of' thepiston from being supported by the wall of the cylinder.V 1 Variousmeans have heretofore been devised for preventingthis Y condition, asfor instance, increasing the diameter of the piston rod. This expedient,however, has not proved satisfactorysince the increased-diameter of thepiston rod mere-4 ly increasesf the', weight thereof which,- to get-herwith the weight ofthepiston, will-pro-y duce suiiicient deflection ofthejpistonrod to cause the pistonto ride more or less heavilyl on oneside of the cylinder. 1 1 flnorder' to prevent such deflection .of thepiston rod,`` in the present 'instance,v heads V and W are, provided forthe ,endsY of the piston rodand atension rodXhavingathreaded end isscrewedV into-"the --headxVV and Y extends through the :pistonrodat'hrough an ,aperture'Zin the head V. A4The opposite end it issuitably space dgandonthe verticalcenter line of the pistonrod sothat aAnfjlaximunrforce may be produced for Vthe purpose gdescribed. Thetension rod Xmayhowevler occupy any other? desired position ,whichwilhenable the piston` rod :H tof-besuitably:held vagainst de-ylection.`

j To the properly protectedagainst the. thrust'of the pistonrodfiinonedirection, a'ange, al is formed `on the; head W to abut thecrosshead L and -a= lock nut escrewed onfthethreaded endoftheypiston'rodlto bearagainst the end ofthe .cross head L protectsthese:threaded `'portions againstV the effects :ofthe thrust of vIn order toholdthe pistonlt against longiv l thatlthecooperatingthreads of i Y' thepiston rod H and the aperture K may be 'the Vpiston rodinlthe oppositedirection. is suitably grooved to receive the usualpiston nuts Vg tobear against the may be greatly reduced in Weighthandthe rod H, the endsof the hub portion Q are provided With threads f on which are screwedton R. f Y

By means of the present invention the reciprocatory elementsfoftha-compressor or engine tolmhich the-.invention maysbeapplied pistonrodH will atlltmes ybe held'against ends of the pisinder, said tensionrodextendingrtlirough the piston rod and being olf-set With respect toYthe longitudinal aXis of the pistonvrod.

In testimony whereof Ihave signed this specification.

thepistonR"niay be heldconcentrically with respect to the cylinder, thusprotecting,-.the i cylinder Walls against excessive Wear Wlii'cliY S0frequently takes Pleeiiafmahvines haring;

pistons of large diameterand consequently great-Weight; w f' fIher'piesent 1in. entionfalsofassures ade'- ing. surfaces :.o' theeylinderlandthjel. piston,

whenever-deflection ofthe-pistonrod-takes place;-

1I claim.: K

A l'i'ollowvpisto'n'-y rodllaving endE heads,

i andm'eansextendingtlirouglr onees'ideiothe piston-rod exertingawforce' ontlieeril heads toi preventcurvature'Lofthey pistoIi-;rod,said `in'eanscontacting with tle -pistonfrod at7tleeztrer"ifi-ities,of-fsaid vpistonA rodi Y n i anda tension rodextending throughI one side heads to prevent curvature 'of-"oliepiston;rod; saidltesion-rodcontactngonlywiththe end heads: j

In combination, a, ,cylinder,a piston, in the i cylinder, ay hollowpistonlrod f orthe piston', means for; securingl f1the, piston; Yinter-V mldiatethe ends ofthepiston' rod; anda ten; sionmodezerting aforcegntle ends of the HAIGHT. r

sof

eluding-i a tension-rod and ainutfzzexertingf af 'forceLon:rthfnheadsAaahel/d1- the intermediate portiomoith/:pistong .rodiagainst deflection dgueixthe mighmethespliwn, thas-Helsing theiprstonconsents-ie respectto-tle cyl`` tothe 'ist

